Portable drills



July 20, 1965 o. E. GUIBERT, JR., ETAL 3,195,375 7 PORTABLE DRILLS FiledAug. 1, 1962 4 Sheets-Sheet 1 1 ENTORS aacAefuqfi/vsg/mem; J2. fiMum/40. JAM/50M J2.

yam M THE/z Arm eusv y 1965 o. E. GUIBERT, JR.. ETAL 3,195,375

PORTABLE DR ILLS Filed Aug. 1, 1962 4 Sheets-Sheet 2 SM W H mfiu u m: x2 E 0 w EJ A hm H T EL Al- Wu? UJv N i y 20, v1965 o. E. GUlBERT, JR.,ETAL 3,195,375

PORTABLE DRILLS Filed Aug. 1, 1962 4 Sheets-Sheet 3 1,111,111., I! Y XTHE/l? ArmeA/E Y July 20, 1965 Filed Aug. 1, 1962 0. E. GUIBERT, JR.,ETAL PORTABLE DRILLS 4 Sheets-Sheet 4 ToRs 0504i EuGA'L Xg/AE JA #W/ZrL/AMD- JAM/50M, Jle.

FIE/E Arrazuv United States Patent PORTABLE DRILLl Oscar Eugene Guibert,J12, Pittsburgh, Pa and Wiiliarn D.

Jamison, Jr., Hudson, Ohio, assignors, by rnesne assignments, to WesternFennsylvania National Bank, a national banking institution, mortgagee,Pittsburgh, Pa.

Filed Aug. 1, 1962, Ser. No. 215,221 Claims. (Cl. 777) This is acontinuation-in-part of application Serial No. 9,322 filed February 17,1960, and now abandoned.

This invention relates generally to drills and more particularly toportable drills.

The problem that arose with portable drills for use in drilling holes inplates and other forms of structural steel laying on the ground or instock piles resides in the excessive weight required to hold and forcethe drill into the metal. Very heavy weights were added to provide theproper drill force as disclosed in US. Patent 1,927,005. The penetratingability of this drill is determined on the weight supported by thecarriage, which weight was obtained by the motor and was augmented bythe counterweights of which there were seventeen in actual practice.These weights were not only outboard of the wheel means but were alsohung on the sides of the carriage making the machine extremely difiicultto handle in moving the same from one drilling position to another oversets as well as structural shapes in a yard or in a structure. Theseweights on the frame of the machine together with the machine weighed1600 pounds and it was necessary to provide the very long operating armwhich not only aided in drilling but also as a leverage for maneuveringand transporting the drill from one hole location to another.

The U-shaped leg is provided on this drill and was always extended whenthe drill was operating to drill a hole. This extended leg supported aportion of the weight of the machine on the member to be drilled torelieve the operator from supporting the machine while the machine wasin drilling position.

The leg and the rollers support the total weight of the machine. As theoperator applies a drilling force to the operating lever the drillengages the work and the weight load redistributes between the rollersand the leg and the drill. As the operator increases the drillingpressure more pressure is transmitted to the drill. The increase indrill pressure reduces the load on the rollers as one would ordinarilysuppose. The increased drill force also increases the pressure betweenthe drill and the work and also increases the holding requirement of theanchor means.

When an increased operator weight load on the operating lever decreasesthe weight load between the rollers and the work to zero, an unstablecondition exists and the drilling operation may swing the machine freeas the weight through the rollers to the work is insufficient tomaintain friction for holding the whole drill carriage from rotatingabout the drill which usually results in the breakage of the drill andif the drill is on a structural part this situation could be quitehazardous to the life and limb of the operator.

The principal object of this invention is the provision of a hold downclamp or anchor that provides a reaction pressure for drilling heavymetal or hard materials without the necessity of a heavy and weightedstructure. This lightweight drill is quickly moved from one holeposition to another. Again the hold down or anchor permits fasterdrilling. Thus the production is increased to more than twice that ofthe weighted drill.

Another object is the provision of a universal joint between the holddown clamp and the work to permit lineal movement for alignment.

33;, l ,3 Patented July 20, 1965 "ice- Another object is the provisionof a mechanical hold down clamp that may operate in a hole, over theedge of the stock, or hooking over both edges of the stock.

Another object is the provision of a hold down clamp, anchor, orreaction pressure member that is magnetic for use in holding the drillagainst magnetizable materials or against nonmagnetizable materialshaving a magnet or magnetizable material thereunder. The magnet has itslimitations in its ability to hold on which is not true of themechanical anchors but the time required to set and reset the mechanicalanchors is offset by the production speed when employing anelectromagnet as an anchor.

When drilling with the machine as disclosed in this application theelectromagnet functions to prevent the wheel means from losing theirload transference. Each means on the frame, wheel means, rotary drillmeans, motor means, linkage means, operating lever means and anchormeans are all selectively positioned on the frame relative to each otherso that the sum of the drilling force and the wheel means load pressureis substantially constant throughout the drill force range. This is whya flexible cable could be employed as this anchor as it actually isdiagrammatically represented by a negative force vector through the fulloperating range and it has the function of retaining additional weightforce through the wheel means 6 against the work with more power todrill and less weight to handle which is a new inventive conception inthis application. Better performance is obtained at higher speeddrilling. The increased horsepower and thrust of this improved drillmakes this possible and was not possible with the old drill.

The increased horsepower and speed of the motor of this drill withoutincreasing the weight of the machine is eifective in increasing thewhole of the machine operating range.

To gain the performance of this improved drill of the presentapplication the machine of the Guibert patent would have to weighapproximately over one ton.

Another object is the provision of an adjustable stop to stop themovement of the drill in either direction.

Other objects and advantages of this invention appear hereinafter in thefollowing description and claims.

The accompanying drawings show for the purpose of exemplificationwithout limiting this invention or the claims thereto, certain practicalembodiments illustrating the principles of this invention; wherein--FIG. 1 is a perspective view of the drill comprising this invention.

FIG. 2 is a view in side elevation of the drill comprising thisinvention.

FIG. 3 is a view in side elevation of a portion of the linkage and thestop.

PEG. 4 is a view in end elevation of the stop shown in FIG. 3.

FIG. 5 is a view in end elevation showing a mechanical clamp thatembraces the work to prevent relative movement to the drill.

FIG. 6 is a View in end elevation showing a clamp in the form of alateral flange to engage in a hole to retain the drill.

FIG. 7 is a detailed view of the pivotal connection in the lever system.

Referring principally to FIGS. 1 and 2 of the drawings the portabledrill comprising this invention includes a frame covered body 1 havingthe depending flanges 2 with a slot 3 in the bottom thereof to receivethe shaft 4 threaded at its ends to receive the nut 5. The shaft 4functions as an axle for the wheels 6 and may be secured to the spacedflanges 27 The wheels 6 preferably extend substantially the full widthof the frame covered body 1 and are preferably made in two sections topermit the drill to be readily turned.

The frame covered body ll provides a pivot member 7 for the arm 8 thatextends beyond the end of the body l. This arm is constructed with atubular member 1d secured to a rod member 1i which'has the pivot 7secured thereto. The rod member 11 is U-shaped and crosses the front ofthe machine as indicated at 12 and the pipe sections are secured to eachface. One or both of the pipe sectionsltl carry the control wires 13which are flexible between the end of the pipe it as indicated at, 14and the clamp 15 on,

the side of the body 1. The flexible cables 13 extend through the, pipeend to the controls, two of whichare shown, one being the switch for themagnet 16 and the switch for the motor 17.

The outer end of-the arm his provided with a seat 2.8

that has handles 20 extending on either side thereof. The operator sitson the seat and controls the electric switches and employs his Weight aspart of the force for drilling the hole.

Adjacent the pivot 7 of the arm 3 the U-shaped rod member 311 isprovided on each side of the machine with an upwardly extending flange21 which carries a spring loaded pin member 22 that forces the pin intoany one of the selected :holes 23 of the yoke 24. pivoted to the link 25of the lever system 26. The link 25 is provided with the pivot 27 at oneend that slides in the slots 28 and the brackets 30 on the upper end ofthe body. The other end of the link 25 is pivoted as indicated at thepivot points 31 on opposite sides to the clutch member 32. The clutchmember 32 is stationary relative to the spindle 33'which it surroundsand is held by the collars 34 that are fixed to the spindle 33 so thatany upward or downward movement of the link 25 will move the spindlevertically. The pivots 31 between the'clutch and the link 25 aredisposed in the vertical axial plane of the spindle 33. The links 35which are held by the pivot 36 that also holds the yoke 24 to the link25 is likewise pivoted to the ears on the upper side of the body l andon each side of the spindle 33 and in line with the axial center of thespindle. Thus the links 35 and the upper portion of the link 25 arecombined to maintain a straight line movement since the pivot 27 mayride back and forth in the slots 28 upon the vertical movement of thehandle 8.

The spindle 33 hasa spline connection with the interior of thetransmission member 37 and is rotatably supported within the frame 1 andis driven from a shaft 33 through the flexible coupling 40 and the shaft4-1 from the electric motor 42. The end of the motor 42 is provided withthe gear reducer '43 which is controlled by the lever shifting device 44to gain different speeds in the. output shaft 41. The boss 45 is for thepurpose of inserting an electric cable to supply the motor and otherparts of the machine with electricity. 7

The'roll end of the spindle 33 is provided with a chuck 46 receiving thedrill members. framel is provided with a transverse foot member 43having a vertical shaft 50 upon which is adjustably secured the levelingfoot 51 which carries the depending section 52 providedwith a transverseshaft 53 that supports the magnet 54'that functions as an anchor. Thusthe magnet 54 is movable about the vertical axis of the shaft Sil. It islikewise movable about the horizontal axis of the shaft 53 for thepurpose of making large adjustments. However, the actual support betweenthe shaft 53 and the magnet 54 is provided with a spherical bearing 55that allows the magnet 54 to have limited universal movement relative tothe leveling foot connector 52. Thus vertical shaft 5i) and'thehorizontal shaft 53 may be employed to obtain their principaladjustments of the magnet and further adjustment is obtained through theuniversal joint of the ball and socket spherical bearing 55. Thisinsures the proper presentation of the under face 56 of the magnet 54against the magnetizable surface in which the magnet holds the body 1 asan anchor and also holds the machine through The yoke 24 is The underside of the t the wheels d to the member to be drilled and against thepressure of drilling. The operator sittingon the seat 13 and operating amagnet switch 16 to anchor the machine in place then operates the switch17 to control the electric motor drive to rotate the spindle and byshoving down and adding his weight to the. end of the arm '8 the drillbores into the steel or other member being drilled. This anchor meansoffsets the operating force such as the weight of the operator formaintaining a load pressure through the wheel means 6 against the memberto be drilled and to increase the drilling pressure without increasingthe Weight of the portable drill.

If the material is nonmagnetic it can be jigged in a steel jig whichfunctions to permit the magnet 54*to'becoine attracted thereto forholding both the material and the tool while the material is beingdrilled.

To supply the magnet 5 with electric energy a rectifier such as a drydisc or a crystalline rectifier structure is mounted as indicated at 57in theframe 1; This rectifier may be full or half wave rectifiersupplied with alternating current to convert the same to direct currentand thereby energize the coil in the magnet that is wound about a C-shaped armature, the pole faces of "which are open to the bottom 56 ofthe magnet 54 for the purpose of maintaining magnetic contact therewith.

While. drilling one must be able to limit the downward aswell as theupward movement of the drill which is accomplished through the linkageas shown in FIG. 3. The under side of the link 25 has the depending link60 pivoted to the pivot point 39 carried by the link 25. The link 63being held in the center of the link 25 by means of the spacers 61. Thelower end of the link 60 is pivoted at 62 to the bifurcated lever member63 that provides the two arms 64 and 65 that arepivoted intermediate oftheir ends at 66 and are connected at their free ends by the rod s7..The arms or and 65 permit the lever 63 to pass on opposite sides of thespindle 33 aud'also extend on opposite sides of the two stop adjustingscrews 68 and 69 both of which are rotatably supported in the bracket'75 and are actuated by the wheels 71 and 72. Each of the stopadjustingscrews are provided with a stop member as indicated at '73 and74. The'stop member 73 is the stop that engages the lever 63 when its.free'end 67 is at the upper end of its movement which would representthe lower stop limit in drilling. The other stop 74- on the screw 63limits the free. end 67 of the lever 63 when swinging in the oppositedirection which is when the drill is raised. Thus by rotating each oneofthe wheels 71 and 72 the stops 73 and 74 may be adjusted so thatwhenthe drill has finished the work it is supposed to do whetherdrilling down or up or whether being raised to go to the next hole, thestops 73 and 74 are so adjustedto limit the extent of the operation ofthe drill. With these stops a drilled hole maybe counter sunk orrearnedas well as drilled. The stops merely function as with any drillingequipment to produce a shoulder or other similar functions in drilling.The hand wheels 71 and 72 are close to the operator station and may bereadily operated to make the proper adjustments of drilling. A rack 75is mounted on the body 1 and is provided with one or more slots 76 toreceive the spring biasedpin 77. By withdrawing the pin 77 from one ofthe slots or holes 76 one may move the tongue. or arm 8 about the pivotpoint 7 and relative to the body ll. This permits the seat 18 andthecontrols associated therewith to be placed at different angles forthe'conveniencc .of the operator and the slots 76 provide a quick modeof returning and interlocking the handle 8 at definite positionsrelative to the body 1. In'some instances it is preferable to have onlyone position so that the handle is always known to be in the most likelyhorizontal position relative to the body. However, a section of openings76 may be provided to effect definite angular positions of the arm ortongue relative to the body 1.

In the structure shown in FIG. 5 the leveling foot 51 has the eye 80extending downwardly therefrom and is secured by the nut 81 to thehorizontal bar 82. The horizontal bar 82. has opposed adjustablebrackets 83 secured thereto by the eye bolts 84 with the nuts 85 and thequick lock earns 86. Thus by throwing the cam away from the bar the eyebolts 84 become loose relative to the horizontal bar 32 and the brackets83 may be readily adjusted therealong. As shown in FIG. 5 the structuralshape is in the form of an I-beam 87 which is to be drilled. The drillis actually oif center for the purpose of drilling the flange byadjusting the brackets 83 relative to the center line. The bottom of thebrackets 33 is permitted to rest on the top of the I-beam 8'7 and theclamping or anchoring fingers 88 are brought upwardly until they engagethe under side of the flange at which time the spiral wedge locks 89 arerotated to hold the clamping fingers tight against the under side of theflange. This mechanical anchor clamp may be employed for drillingnonmagnetic materials or even magnetic materials but it is some: whatslower owing to the fact that the anchor clamp has to be adjusted byhand, whereas the electromagnet merely requires the throwing of aswitch.

The other mechanical hold down or anchor is in the form of a hold lockwherein the horizontal bar 82 is provided with a bracket 90 that hasdepending therefrom the stern member 91 provided with a head 92 whichhead is smaller in diameter than the hole 93 in the flange or plate 94which represents the workpiece. This permits the head 92 to be droppeddown through the hole 93 and caught under the same as shown in FIG. 6. Asleeve 95 which is slidable over the head 92 is of course larger thanthe hole 93 and engages the upper surface of the workpiece 94. The stem91 is provided with a slot 96 to receive the wedge 97. When the wedge 97is driven into the slot 96 it forces the sleeve 95 against the topsurface of the workpiece and thereby mechanically holds or anchors thedrill against movement. Here again the mechanical device to hold thedrill in place takes more time to operate than the electromagnet.

The drill comprising this invention has a total weight of seven hundredand thirty pounds as against fourteen hundred and sixty-six pounds forthe drill of the aforementioned patent. This latter machine has sideweights of 601 pounds and rear weights of 352 pounds. The machine itselfweighs 513 pounds.

The following nomenclature represents the several weights and forces ofthe patented drill and the present drill.

Patented Present F1= Operating force Ws=Stripped machine weight W1=Sideweights W2= Rear weights W=T0tal machine weight Rw=Wheel r n Rf= Footrcaeti0n Rm=Magnet reactiom Rs Spindle reactiorn- The following is acomparative table of both machines.

Old Machine New Machine F1 Re R] Rw Fl+Rw Fl Rs Rm Rw Fl-l-Rw It will beseen from the foregoing tabulation that the drill comprising thisinvention provides a machine wherein the wheel means, the drill means,the motor means and the lever and linkage means are selectivelypositioned relative to each other and to the anchor means so that thesum of the force applied to the operating means and the load pressurethrough said wheel means to the member to be drilled remainssubstantially constant drilling range as shown by these tabulations.

We claim:

1. A portable drill comprising a frame having wheel means to support amotor driven drill as a mobile unit, the drill being operated by anactuating mechanism through an operating lever pivoted on said frame andextending in a direction opposite from the Wheel means relative to saiddrill, characterized by a pivot for said operating lever positioned onsaid frame in a vertical plane between said wheel means and said drill,and a pivotal connecting means between said operating lever and saiddrill actuating mechanism is connected to said operating leverintermediate the positions of said pivot and said drill means.

2. A portable drill comprising a frame having wheel means to support amotor driven drill as a mobile unit, the drill being operated by anactuating mechanism through an operating lever pivoted on said frame andextending in a direction opposite from the wheel means relative to saiddrill, characterized by a pivot for said operating lever positioned onsaid frame in a vertical plane between said wheel means and said drill,a second pivot on said frame on the opposite side of said drill thansaid wheel means, a lever pivotally mounted on said second pivot, a linkpivotally connected to one end of said lever and at its other end tosaid drill actuating mechanism to operate therewith, and adjustablestops on said frame to engage the other end of said lever to limit thevertical travel of said drill.

3. A portable drill comprising a frame having wheel means to support amotor driven drill as a mobile unit, the drill being actuated by anoperating lever having a pivot on said frame and extending in adirection opposite from the wheel means relative to said drill,characterized by a magnetic clamp means to anchor said frame relative tothe work by its connection to said frame between said drill and saidwheel means, a pivot for said operating lever positioned on said framein a vertical plane between said wheel means and said drill, and apivotal connecting means between said operating lever and said drillconnected to said operating lever intermediate the positions of saidpivot and said drill means.

4. A portable drill comprising a frame having wheel means to support amotor driven drill as a mobile unit, the drill being actuated by anoperating lever pivoted on said frame and extending in a directionopposite from the wheel means relative to said drill, characterized by apivot for said operating lever positioned on said frame in a verticalplane between said wheel means and said drill, a magnet to anchor saidframe relative to the work by its connection to said frame between saiddrill and wheel means, said operating lever pivot positioned on saidframe between said wheel means and said magnet connection, and pivotallyconnecting means between said operating lever and said drill connectedto said operating lever in a vertical plane between said pivot means andsaid magnet connection.

5. A portable drill comprising a frame having wheel means to support amotor driven drill as a mobile unit, the drill being operated by anactuating mechanism operated by an operating lever pivoted on said frameand extending in a direction opposite from the wheel means relative tosaid drill, a pivot for said operating lever positioned on said frame ina vertical plane between said wheel means and said drill, pivotallyconnecting means between said operating lever and said drill in avertical plane intermediate said frame pivot and said drill means, asecond pivot on said frame on the opposite side of said drill than saidwheel means, a lever pivotally mounted on said second pivot, a linkpivotally connecting one end of said lever and at its other end to saiddrill actuating 7 8 mechanism to operate therewith, and adjustable stopson 980,100 12/10 Hastings 77-13 said frame to engage the other end ofsaid lever to limit 1,010,975 12/11 Stroner et -al. 77-7 the verticaltravel of said drill. 1,763,552 6/30 Cook: 77-7 1,927,005 9/33 G'uibertet a1. 77-7 References Cited by the Examiner W. JR., Primary Examiner.

34 165 10/99 Groneau 77 .TOl-IN C. CHRISTIE, Examiner.

1. A PORTABLE DRILL COMPRISING A FRAME HAVING WHEEL MEANS TO SUPPORT AMOTOR DRIVEN DRILL AS A MOBILE UNIT, THE DRILL BEING OPERATED BY ANACTUATING MECHANISM THROUGH AN OPERATING LEVER PIVOTED ON SAID FRAME ANDEXTENDING IN A DIRECTION OPPOSITE FROM THE WHEEL MEANS RELATIVE TO SAIDDRILL, CHARACTERIZED BY A PIVOT FOR SAID OPERATING LEVER POSITIONED ONSAID FRAME IN A VERTICAL PLANE BETWEEN SAID WHEEL MEANS AND SAID DRILL,AND A PIVOTAL CONNECTING MEANS BETWEEN SAID OPERATING LEVER